Abstract
In this study, an aqueous sol-gel synthesis method and subsequent dip-coating technique were applied for the preparation of yttrium iron garnet (YIG), yttrium iron perovskite (YIP), and terbium iron perovskite (TIP) bulk and thin films. The monophasic highly crystalline different iron ferrite powders have been synthesized using this simple aqueous sol-gel process displaying the suitability of the method. In the next step, the same sol-gel solution was used for the fabrication of coatings on monocrystalline silicon (100) using a dip-coating procedure. This resulted, likely due to substrate surface influence, in all coatings having mixed phases of both garnet and perovskite. Thermogravimetric (TG) analysis of the precursor gels was carried out. All the samples were investigated by X-ray powder diffraction (XRD) analysis. The coatings were also investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM) and Mössbauer spectroscopy. Magnetic measurements were also carried out.
Highlights
The interest in perovskite and garnet ceramics has been growing steadily over recent years
For the sol-gel synthesis, the nitrates were dissolved in 20 mL of deionized water (3.1142 g (8.1309 mmol) yttrium nitrate for yttrium iron garnet (YIG); 4.7653 g (12.442 mmol) for yttrium iron perovskite (YIP); as-synthesized terbium nitrate for terbium iron perovskite (TIP))
The simple aqueous sol-gel method using inorganic salts as starting materials was found to be suitable for the preparation of monophasic yttrium iron garnet (YIG), yttrium iron perovskite (YIP), and terbium iron perovskite (TIP) three-dimensional powders
Summary
The interest in perovskite and garnet ceramics has been growing steadily over recent years. The reason is very different, ; where the garnet structure is rigid, the perovskite structure is flexible, prone to deformation, which disrupts symmetry [16,17]. This disruption of symmetry can sometimes be very advantageous; for example, it can be the cause of ferroelectricity and similar phenomena. Some tentative control over the properties from a structural design standpoint is possible, if the ionic radii and electronic structures of constituent ions are considered [18,19,20]
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